==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:384 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x882/0x9c0 net/ipv4/tcp_timer.c:648
Read of size 1 at addr ffff888072c5a0cd by task kworker/1:6/3562
CPU: 1 PID: 3562 Comm: kworker/1:6 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events pwq_unbound_release_workfn
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
tcp_probe_timer net/ipv4/tcp_timer.c:384 [inline]
tcp_write_timer_handler+0x882/0x9c0 net/ipv4/tcp_timer.c:648
tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:664
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:synchronize_rcu+0x0/0x1a0 kernel/rcu/tree.c:3790
Code: e8 95 d5 5e 00 e9 68 fd ff ff 48 c7 c7 e0 43 92 8c 48 89 de e8 01 0e be 02 e9 b5 fa ff ff e8 d7 d5 b0 08 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 54 53 48 83 e4 e0 48 81 ec 00 01 00 00
RSP: 0018:ffffc900044e7b38 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200089cf70 RCX: ffffffff913c7f03
RDX: 0000000000000001 RSI: ffffffff8a8b2300 RDI: ffffffff8ad88fc0
RBP: ffffc900044e7c08 R08: dffffc0000000000 R09: fffffbfff2276d86
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff913b3778
R13: 1ffff9200089cf6c R14: 0000000000000202 R15: ffffc900044e7b80
lockdep_unregister_key+0x4e6/0x5b0 kernel/locking/lockdep.c:6319
wq_unregister_lockdep kernel/workqueue.c:3518 [inline]
pwq_unbound_release_workfn+0x23d/0x290 kernel/workqueue.c:3756
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Allocated by task 3516:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3101
__do_sys_unshare kernel/fork.c:3175 [inline]
__se_sys_unshare kernel/fork.c:3173 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3173
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff888072c59a40
which belongs to the cache net_namespace of size 6464
The buggy address is located 1677 bytes inside of
6464-byte region [ffff888072c59a40, ffff888072c5b380)
The buggy address belongs to the page:
page:ffffea0001cb1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888072c59a40 pfn:0x72c58
head:ffffea0001cb1600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801d3c6bc1
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888011dea3c0
raw: ffff888072c59a40 0000000080040002 00000001ffffffff ffff88801d3c6bc1
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3518, ts 44409029888, free_ts 32993504905
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3101
__do_sys_unshare kernel/fork.c:3175 [inline]
__se_sys_unshare kernel/fork.c:3173 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3173
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
put_page include/linux/mm.h:1247 [inline]
__skb_frag_unref include/linux/skbuff.h:3219 [inline]
skb_release_data+0x411/0x8a0 net/core/skbuff.c:672
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb+0x4c/0x60 net/core/skbuff.c:756
sk_eat_skb include/net/sock.h:2716 [inline]
tcp_recvmsg_locked+0x1629/0x29b0 net/ipv4/tcp.c:2516
tcp_recvmsg+0x24e/0x7f0 net/ipv4/tcp.c:2562
inet_recvmsg+0x157/0x280 net/ipv4/af_inet.c:859
sock_recvmsg_nosec net/socket.c:966 [inline]
sock_recvmsg net/socket.c:984 [inline]
sock_read_iter+0x353/0x480 net/socket.c:1057
call_read_iter include/linux/fs.h:2142 [inline]
new_sync_read fs/read_write.c:404 [inline]
vfs_read+0xa9f/0xe10 fs/read_write.c:485
ksys_read+0x1a2/0x2c0 fs/read_write.c:623
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Memory state around the buggy address:
ffff888072c59f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888072c5a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888072c5a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888072c5a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888072c5a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: e8 95 d5 5e 00 call 0x5ed59a
5: e9 68 fd ff ff jmp 0xfffffd72
a: 48 c7 c7 e0 43 92 8c mov $0xffffffff8c9243e0,%rdi
11: 48 89 de mov %rbx,%rsi
14: e8 01 0e be 02 call 0x2be0e1a
19: e9 b5 fa ff ff jmp 0xfffffad3
1e: e8 d7 d5 b0 08 call 0x8b0d5fa
23: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
* 2a: 55 push %rbp <-- trapping instruction
2b: 48 89 e5 mov %rsp,%rbp
2e: 41 57 push %r15
30: 41 56 push %r14
32: 41 54 push %r12
34: 53 push %rbx
35: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp
39: 48 81 ec 00 01 00 00 sub $0x100,%rsp